This January 8, 2014 HealthDay article on the Philly.com website talks about research that indicates most teens are getting less than 1 hour of physical activity per day. The research also finds that teens who are obese tend to be less likely to be physically active then teens of a healthy weight. This observation has researchers wondering if obesity causes decreased activity or if decreased activity causes obesity (made me think of which came first? the chicken? or the egg?)

Two mice; the mouse on the left has more fat stores than the mouse on the right. (Photo credit: Wikipedia)